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fatal: get_service_attr: unknown username: vmail

Hello
I have followed several tutorials and the all are about the same. I am on ubuntu 10.04 LTS Using postfix and dovecot. In each tutorial I get stuck with a postfix error fatal: get_service_attr: unknown username: vmail fallowed by a devecot error. My mail log as follows:

Instructions are the same set up a user with uid = 5000 and gid = 5000, some the numbers are different but the idea is the same. I have redone everything 3 times and always get the same error. I don't know if it is related but postfix dose not see the user nilandjp:user either. I have searched the web High and Low and have no answer. the latest tutorial //wiki.vpslink.com/HOWTO:_ISP-style_Email_Server_with_Debian-Etch_and_Postfix_2.3]HOWTO: ISP-style Email Server with Debian-Etch and Postfix 2.3 - VPSLink Wiki is similar. Is this a Postfix version 2.7.0 problem? How do I solve it?